Pump coupling



Patented Jan. 22, 1924.

1,481,516 PATENT OFFlCE.

HENRY PHILLIP KRAFT, OF BIDGEWOOD, NEW JERSEY.

PUMP COUPLING.

Application filed Augusti, 1921.

To all whom it may concern:

Be it known that I, HENRY PHILLIP KRAFT, a citizen of the United Statesof America, residing in Ridgewood, in the county of Bergen and State ofNew Jersey,

have invented certain new and useful Improvements in Pump Couplings, ofwhich the following is specification,

The present invention relates to pump couplings and aims to providecertain useful improvements therein.

The present invention is particularl directed to that type of pumpcoupling w ereby a quick attachment. and detachment of said couplingwith a tire valve or the like may be readily made, and one whereinnotwithstanding its comparative simple construction, provides a verysecure union between the coupled parts. A- pump coupling ofsuchconstruction is disclosed 1n my lier filed application Serial No.471,274, filed May 20, 1921.

According to the present invention a pump coup ingof the same generalcharacter as that disclosed in my earlier filed ap plication isprovided, the important features of improvement beingin the manner ofconstruction and the materials l sed. Where, in the earlier filedconstruction the body ortion of the coupling is preferably made rombrass stock of appropriatecross section by subjectin it to the necessarycutting drawing and tion of the device according to the presentinvention is preferably formed of aluminum by the die casting process.The wear resist ing qualities of luminum however bein not as good asthose of brass, the parts 0% the pump coupling which are subjected togreatest wear are preferably made from hard brass or other hardnon-oxidizable metal.

Broadly speaking the invention may be said to consist of a pump couplingformed of aluminum having an enlarged bore adapted to fit over a valvenipple or other threaded member and a manually operable dog adapted tobe moved into said bore to engage the valve nipple to hold the couplingthereon. The inner wall of the'bore and the movable dog being the partsof the couplin which are subjected to wear, they are pre ormingoperations, the body p0r-.

.18 move Serial No. 490,175.

its utility. The invention also includes other features of improvementwhich will be hereinafter more fully set forth.

Referring to the drawings which show two embodiments of the invention:

Figure 1 is a longitudinal section, showing the coupling in engagementwith a valve nipple;

igure 2 is a section'taken on the line 2+2 of Figure 1;

Figure 3 is atransverse section of Figure 1 taken on the line .3-3; 1

Figure 4 is a longitudinal section, showing{,a modification. eferring tothe drawings, let A indicate the coupling as a whole, which consists ofa body portion B and the usual shank G for engagement with a rubberhose. The bbdy portion B is Breferably enlarged and formed with a borewhich is adapted to pass over the end of a valve nipple, the wall of thebore D being preferably unthreaded so as to slip easily over said valve.nipple. The

The dog is formed with flat sides which act .to guide the dog andmaintain the screw threads thereon in roper alignment with respect tothe valve nipple. The head of the dog is enlarged as indicated by theletter 7 (Fig. 1), said enlarged head serving as a stop, limiting theinward movement of the dog and also as a bearing surface for anoperating cam G by means of. which the do inwardly. The operating cam 6is in the form of a quadrant of a circle the inner end of which isrounded and pivotally mounted off center on a pin I- supported by a.pair of ears I) integrally formed on the body portion. The manipulatingedge of the operating cam is herein'shown as roughened or milled toprovide a good gripping surface for the finger. The foregoin descriptionsubstantially describes an em odiment of my invention disclosed in myearlier filed application hereinbefore mentioned, and is not broadlyclaimed herein.

According to the present invention, substantially the same mechanicaloperation of the device is maintained, but the construction is such thatthe device is much lighter and can more easily and cheaply made.

This I accomplish by die casting the body portion, shank and earsfromsome easily castable metal, preferably aluminum. How ever, as castaluminum is comparatively soft and has not the wear resisting qualitiesand hardness essential to screw thread clamping elements, the screwthread engaging surfaces of the coupling are hence made from some hardmetal. It is also" essential that this hard metal be substantiallynon-oxidizable. otherwise the utility of the device will be greatlyimpaired. As seen in the drawings, the parts of the pump coupling of thetype disclosed which are subjected to the greatest Wear are the bore Dof the body portion B, the dog E and the pin I. These parts areaccordlngly made of brass or other suitable hard non-oxidizablematerial. In order to provide the bore of the'body poi-tion with asuitable lining of wear resisting material, said bore during the castingoperation is formed with a portion of larger diameter indicated at K.Into this enlarged bore K is forced a hard brass bushing. L which isprovided with a suitable recess to accommoate the dog F. The bushingalso acts to retain a sealing gasket M within the coupling. The gasket Mmay be of any desired construction and is herein shown as a plunger,formed with a conical bore m the base of the said bore facing the shankC whereby a greater surface is exposed to the incoming pressure, thusinsuring a more perfectseal between the coupling and the end of the tirevalve.

The device disclosed in Figure 4 only differs from that shown in Figures1-3 in that the coupling is formed with the hose shank at an angle tothe body portion instead of, in alignment therewith.

In operation, to apply the device the operating cam or finger piece ispositioned so that the dog lies either in itsretracted position shown inFigure 4, or so that it may be readily moved into said position uponcontacting the valve nipple. In this position the coupling is slippedover the valve nipple and the finger piece tilted or rotated downwardlyto bring the threaded dog'into engagement with the nipple, as shown inFigure 1. A

very secure connection is thus provided.

limited to the particular construction illustrated since variousmodifications may be resorted to without departing from the spirit ofthe invention.

What I claim is 1. A pump coupling or the like comprising a shank, abody portion having a recess therein, a dog movable in said recess, anda sleeve within the body portion, said I body portion being formed ofeasily castable metal and the dog and sleeve being formed ofnon-oxidizable wear resisting metal.

2. A pump coupling or the like, comprising abody portion having anenlarged bore therein, .a dog movable in said bore and adapted to engagea valve nipple or the like to hold the coupling thereon and a sleeve insaid bore through which said dog is movable.

3. A pump coupling or thelike, compris ing a recessed body portionhaving an enlarged bore the-rein, a dog movable in said bore and adaptedto engage a, valve nipple or the like to hold the coupling thereon and arecessed sleeve in said bore through which said dog is movable, therecesses in the body portion and sleeve substantially coinciding.

4. A pump coupling or the like, comprising a body portion having twobores, the

larger being in advance of the smaller, av

plunger gasket in the smaller bore, a sleeve in the larger bore holdingsaid gasket in operative position and a dog movable in the bore oflarger diameter through said sleeve.

In witness whereof, I have hereunto signed my name.

- HENRY PHILLIP KRAFT.

